29. Pensieve
She was drinking lemonade on the porch of his family’s farm....They were walking down a long and quiet lane in the hot summer afternoon.

Suddenly the scene changed again and an eighteen year old Minerva was standing in a field with Dougal McGregor, and he was on one knee. An exclamation, and then they were both kissing.

Again smoke rose and the scene changed for the last time. She was at the McGregor household and she had to lie and say she was no longer interested.
The visions ended and a much older McGonagall wiped a tear from her cheek.